<template>
  <div>
    <div class="form_picker_title" @click="show()" v-if="title!==''">
      <div class="picker_title-left">{{title}}</div>
      <div>{{pickerModel}}</div>
      <div>
        <x-icon name="icon-zk-jiantou" :color="'#909399'" size="15"></x-icon>
      </div>
    </div>
    <view class="mpvue-picker">
      <view :class="{'pickerMask':showPicker}" @click="maskClick" catchtouchmove="true"></view>
      <view class="mpvue-picker-content " :class="{'mpvue-picker-view-show':showPicker}">
        <view class="mpvue-picker__hd" catchtouchmove="true">
          <view class="mpvue-picker__action" @click="pickerCancel">取消</view>
          <view class="mpvue-picker__action" :style="{color:themeColor}" @click="pickerConfirm">确定</view>
        </view>
        <!-- 单列 -->
        <picker-view indicator-style="height: 40px;" class="mpvue-picker-view" :value="pickerValue" @change="pickerChange" v-if="mode==='selector' && pickerValueSingleArray.length > 0">
          <block>
            <picker-view-column>
              <view class="picker-item" v-for="(item,index) in pickerValueSingleArray" :key="index">{{item.label}}</view>
            </picker-view-column>
          </block>
        </picker-view>
        <!-- 时间选择器 -->
        <picker-view indicator-style="height: 40px;" class="mpvue-picker-view" :value="pickerValue" @change="pickerChange" v-if="mode==='timeSelector'">
          <block>
            <picker-view-column>
              <view class="picker-item" v-for="(item,index) in pickerValueHour" :key="index">{{item.label}}</view>
            </picker-view-column>
            <picker-view-column>
              <view class="picker-item" v-for="(item,index) in pickerValueMinute" :key="index">{{item.label}}</view>
            </picker-view-column>
          </block>
        </picker-view>
        <!-- 多列选择 -->
        <picker-view indicator-style="height: 40px;" class="mpvue-picker-view" :value="pickerValue" @change="pickerChange" v-if="mode==='multiSelector'">
          <block v-for="(n,index) in pickerValueMulArray.length" :key="index">
            <picker-view-column>
              <view class="picker-item" v-for="(item,index1) in pickerValueMulArray[n]" :key="index1">{{item.label}}</view>
            </picker-view-column>
          </block>
        </picker-view>
        <!-- 二级联动 -->
        <picker-view indicator-style="height: 40px;" class="mpvue-picker-view" :value="pickerValue" @change="pickerChangeMul" v-if="mode==='multiLinkageSelector' && deepLength===2">
          <block>
            <picker-view-column>
              <view class="picker-item" v-for="(item,index) in pickerValueMulTwoOne" :key="index">{{item.label}}</view>
            </picker-view-column>
            <picker-view-column>
              <view class="picker-item" v-for="(item,index) in pickerValueMulTwoTwo" :key="index">{{item.label}}</view>
            </picker-view-column>
          </block>
        </picker-view>
        <!-- 三级联动 -->
        <picker-view indicator-style="height: 40px;" class="mpvue-picker-view" :value="pickerValue" @change="pickerChangeMul" v-if="mode==='multiLinkageSelector' && deepLength===3">
          <block>
            <picker-view-column>
              <view class="picker-item" v-for="(item,index) in pickerValueMulThreeOne" :key="index">{{item.label}}</view>
            </picker-view-column>
            <picker-view-column>
              <view class="picker-item" v-for="(item,index) in pickerValueMulThreeTwo" :key="index">{{item.label}}</view>
            </picker-view-column>
            <picker-view-column>
              <view class="picker-item" v-for="(item,index) in pickerValueMulThreeThree" :key="index">{{item.label}}</view>
            </picker-view-column>
          </block>
        </picker-view>
      </view>
    </view>

  </div>
</template>

<script>
  export default {
    data () {
      return {
        pickerModel: null,
        pickerChangeValue: [],
        pickerValue: [],
        pickerValueArrayChange: true,
        modeChange: false,
        pickerValueSingleArray: [],
        pickerValueHour: [],
        pickerValueMinute: [],
        pickerValueMulArray: [],
        pickerValueMulTwoOne: [],
        pickerValueMulTwoTwo: [],
        pickerValueMulThreeOne: [],
        pickerValueMulThreeTwo: [],
        pickerValueMulThreeThree: [],
        /* 是否显示控件 */
        showPicker: false
      }
    },
    props: {
      /* mode */
      mode: {
        type: String,
        default: 'selector'
      },
      /* picker 数值 */
      pickerValueArray: {
        type: Array,
        default () {
          return []
        }
      },
      /* 默认值 */
      pickerValueDefault: {
        type: Array,
        default () {
          return []
        }
      },
      /* 几级联动 */
      deepLength: {
        type: Number,
        default: 2
      },
      /* 主题色 */
      themeColor: String,
      title: {
        default: ''
      }
    },
    watch: {
      // pickerValueArray (oldVal, newVal) {

      // },
      mode (oldVal, newVal) {
        this.modeChange = true
      },
      pickerValueArray (val) {
        this.pickerValueArrayChange = true
        this.initPicker(val)
      }
    },
    mounted () {
      this.init()
    },
    methods: {
      init () {
        if (this.pickerValueDefault.length !== 0) {
          this.pickerModel = this.pickerValueArray[this.pickerValueDefault[0]].label
        }
      },
      initPicker (valueArray) {
        let pickerValueArray = valueArray
        this.pickerValue = this.pickerValueDefault
        // 初始化多级联动
        if (this.mode === 'selector') {
          this.pickerValueSingleArray = valueArray
        } else if (this.mode === 'timeSelector') {
          this.modeChange = false
          let hourArray = []
          let minuteArray = []
          for (let i = 0; i < 24; i++) {
            hourArray.push({
              value: i,
              label: i > 9 ? `${i} 时` : `0${i} 时`
            })
          }
          for (let i = 0; i < 60; i++) {
            minuteArray.push({
              value: i,
              label: i > 9 ? `${i} 分` : `0${i} 分`
            })
          }
          this.pickerValueHour = hourArray
          this.pickerValueMinute = minuteArray
        } else if (this.mode === 'multiSelector') {
          this.pickerValueMulArray = valueArray
        } else if (this.mode === 'multiLinkageSelector' && this.deepLength === 2) {
          // 两级联动
          let pickerValueMulTwoOne = []
          let pickerValueMulTwoTwo = []
          // 第一列
          for (let i = 0, length = pickerValueArray.length; i < length; i++) {
            pickerValueMulTwoOne.push(pickerValueArray[i])
          }
          // 渲染第二列
          // 如果有设定的默认值
          if (this.pickerValueDefault.length === 2) {
            let num = this.pickerValueDefault[0]
            for (
              let i = 0, length = pickerValueArray[num].children.length; i < length; i++
            ) {
              pickerValueMulTwoTwo.push(pickerValueArray[num].children[i])
            }
          } else {
            for (
              let i = 0, length = pickerValueArray[0].children.length; i < length; i++
            ) {
              pickerValueMulTwoTwo.push(pickerValueArray[0].children[i])
            }
          }
          this.pickerValueMulTwoOne = pickerValueMulTwoOne
          this.pickerValueMulTwoTwo = pickerValueMulTwoTwo
        } else if (
          this.mode === 'multiLinkageSelector' &&
          this.deepLength === 3
        ) {
          let pickerValueMulThreeOne = []
          let pickerValueMulThreeTwo = []
          let pickerValueMulThreeThree = []
          // 第一列
          for (let i = 0, length = pickerValueArray.length; i < length; i++) {
            pickerValueMulThreeOne.push(pickerValueArray[i])
          }
          // 渲染第二列
          this.pickerValueDefault =
            this.pickerValueDefault.length === 3 ? this.pickerValueDefault : [0, 0, 0]
          if (this.pickerValueDefault.length === 3) {
            let num = this.pickerValueDefault[0]
            for (
              let i = 0, length = pickerValueArray[num].children.length; i < length; i++
            ) {
              pickerValueMulThreeTwo.push(pickerValueArray[num].children[i])
            }
            // 第三列
            let numSecond = this.pickerValueDefault[1]
            for (let i = 0, length = pickerValueArray[num].children[numSecond].children.length; i < length; i++) {
              pickerValueMulThreeThree.push(
                pickerValueArray[num].children[numSecond].children[i]
              )
            }
          }
          this.pickerValueMulThreeOne = pickerValueMulThreeOne
          this.pickerValueMulThreeTwo = pickerValueMulThreeTwo
          this.pickerValueMulThreeThree = pickerValueMulThreeThree
        }
      },
      show () {
        setTimeout(() => {
          if (this.pickerValueArrayChange || this.modeChange) {
            this.initPicker(this.pickerValueArray)
            this.showPicker = true
            this.pickerValueArrayChange = false
            this.modeChange = false
          } else {
            this.showPicker = true
          }
        }, 0)
      },
      maskClick () {
        this.pickerCancel()
      },
      pickerCancel () {
        this.showPicker = false
        this._initPickerVale()
        let pickObj = {
          index: this.pickerValue,
          value: this._getPickerLabelAndValue(this.pickerValue, this.mode).value,
          label: this._getPickerLabelAndValue(this.pickerValue, this.mode).label
        }
        this.$emit('onCancel', pickObj)
      },
      pickerConfirm (e) {
        this.showPicker = false
        this._initPickerVale()
        let pickObj = {
          index: this.pickerValue,
          value: this._getPickerLabelAndValue(this.pickerValue, this.mode).value,
          label: this._getPickerLabelAndValue(this.pickerValue, this.mode).label
        }
        this.$emit('onConfirm', pickObj)
        this.pickerModel = pickObj.label
        var value = [pickObj.value[0]]
        this.$emit('input', value)
      },
      showPickerView () {
        this.showPicker = true
      },
      pickerChange (e) {
        this.pickerValue = e.mp.detail.value
        let pickObj = {
          index: this.pickerValue,
          value: this._getPickerLabelAndValue(this.pickerValue, this.mode).value,
          label: this._getPickerLabelAndValue(this.pickerValue, this.mode).label
        }
        this.$emit('onChange', pickObj)
      },
      pickerChangeMul (e) {
        if (this.deepLength === 2) {
          let pickerValueArray = this.pickerValueArray
          let changeValue = e.mp.detail.value
          // 处理第一列滚动
          if (changeValue[0] !== this.pickerValue[0]) {
            let pickerValueMulTwoTwo = []
            // 第一列滚动第二列数据更新
            for (let i = 0, length = pickerValueArray[changeValue[0]].children.length; i < length; i++) {
              pickerValueMulTwoTwo.push(pickerValueArray[changeValue[0]].children[i])
            }
            this.pickerValueMulTwoTwo = pickerValueMulTwoTwo
            // 第二列初始化为 0
            changeValue[1] = 0
          }
          this.pickerValue = changeValue
        } else if (this.deepLength === 3) {
          let pickerValueArray = this.pickerValueArray
          let changeValue = e.mp.detail.value
          let pickerValueMulThreeTwo = []
          let pickerValueMulThreeThree = []
          // 重新渲染第二列
          // 如果是第一列滚动
          if (changeValue[0] !== this.pickerValue[0]) {
            this.pickerValueMulThreeTwo = []
            for (let i = 0, length = pickerValueArray[changeValue[0]].children.length; i < length; i++) {
              pickerValueMulThreeTwo.push(pickerValueArray[changeValue[0]].children[i])
            }
            // 重新渲染第三列
            for (let i = 0, length = pickerValueArray[changeValue[0]].children[0].children.length; i <
              length; i++) {
              pickerValueMulThreeThree.push(pickerValueArray[changeValue[0]].children[0].children[i])
            }
            changeValue[1] = 0
            changeValue[2] = 0
            this.pickerValueMulThreeTwo = pickerValueMulThreeTwo
            this.pickerValueMulThreeThree = pickerValueMulThreeThree
          } else if (changeValue[1] !== this.pickerValue[1]) {
            // 第二列滚动
            // 重新渲染第三列
            this.pickerValueMulThreeThree = []
            pickerValueMulThreeTwo = this.pickerValueMulThreeTwo
            for (let i = 0, length = pickerValueArray[changeValue[0]].children[changeValue[1]].children.length; i < length; i++) {
              pickerValueMulThreeThree.push(pickerValueArray[changeValue[0]].children[changeValue[1]].children[i])
            }
            changeValue[2] = 0
            this.pickerValueMulThreeThree = pickerValueMulThreeThree
          }
          this.pickerValue = changeValue
        }
        let pickObj = {
          index: this.pickerValue,
          value: this._getPickerLabelAndValue(this.pickerValue, this.mode).value,
          label: this._getPickerLabelAndValue(this.pickerValue, this.mode).label
        }
        this.$emit('onChange', pickObj)
      },
      // 获取 pxikerLabel
      _getPickerLabelAndValue (value, mode) {
        let pickerLable
        let pickerGetValue = []
        // selector
        if (mode === 'selector') {
          pickerLable = this.pickerValueSingleArray[value].label
          pickerGetValue.push(this.pickerValueSingleArray[value].value)
        } else if (mode === 'timeSelector') {
          pickerLable = `${this.pickerValueHour[value[0]].label}-${this.pickerValueMinute[value[1]].label}`
          pickerGetValue.push(this.pickerValueHour[value[0]].value)
          pickerGetValue.push(this.pickerValueHour[value[1]].value)
        } else if (mode === 'multiSelector') {
          for (let i = 0; i < value.length; i++) {
            if (i > 0) {
              pickerLable += this.pickerValueMulArray[i][value[i]].label + (i === value.length - 1 ? '' : '-')
            } else {
              pickerLable = this.pickerValueMulArray[i][value[i]].label + '-'
            }
            pickerGetValue.push(this.pickerValueMulArray[i][value[i]].value)
          }
        } else if (mode === 'multiLinkageSelector') {
          /* eslint-disable indent */
          pickerLable =
            this.deepLength === 2 ? `${this.pickerValueMulTwoOne[value[0]].label}-${this.pickerValueMulTwoTwo[value[1]].label}` : `${this.pickerValueMulThreeOne[value[0]].label}-${this.pickerValueMulThreeTwo[value[1]].label}-${this.pickerValueMulThreeThree[value[2]].label}`
          if (this.deepLength === 2) {
            pickerGetValue.push(this.pickerValueMulTwoOne[value[0]].value)
            pickerGetValue.push(this.pickerValueMulTwoTwo[value[1]].value)
          } else {
            pickerGetValue.push(this.pickerValueMulThreeOne[value[0]].value)
            pickerGetValue.push(this.pickerValueMulThreeTwo[value[1]].value)
            pickerGetValue.push(this.pickerValueMulThreeThree[value[2]].value)
          }
          /* eslint-enable indent */
        }
        return {
          label: pickerLable,
          value: pickerGetValue
        }
      },
      // 初始化 pickerValue 默认值
      _initPickerVale () {
        if (this.pickerValue.length === 0) {
          if (this.mode === 'selector') {
            this.pickerValue = [0]
          } else if (this.mode === 'multiSelector') {
            this.pickerValue = new Int8Array(this.pickerValueArray.length)
          } else if (
            this.mode === 'multiLinkageSelector' &&
            this.deepLength === 2
          ) {
            this.pickerValue = [0, 0]
          } else if (
            this.mode === 'multiLinkageSelector' &&
            this.deepLength === 3
          ) {
            this.pickerValue = [0, 0, 0]
          }
        }
      }
    }
  }
</script>

<style>
  .form_picker_title {
    height: 35px;
    display: flex;
    align-items: center;
  }
  .picker_title-left {
    flex: 1;
    font-size: 12px;
  }
  .pickerMask {
    position: fixed;
    z-index: 1000;
    top: 0;
    right: 0;
    left: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
  }

  .mpvue-picker-content {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    transition: all 0.3s ease;
    transform: translateY(100%);
    z-index: 3000;
  }

  .mpvue-picker-view-show {
    transform: translateY(0);
  }

  .mpvue-picker__hd {
    display: flex;
    padding: 9px 15px;
    background-color: #fff;
    position: relative;
    text-align: center;
    font-size: 17px;
  }

  .mpvue-picker__hd:after {
    content: " ";
    position: absolute;
    left: 0;
    bottom: 0;
    right: 0;
    height: 1px;
    border-bottom: 1px solid #e5e5e5;
    color: #e5e5e5;
    transform-origin: 0 100%;
    transform: scaleY(0.5);
  }

  .mpvue-picker__action {
    display: block;
    flex: 1;
    color: #1aad19;
  }

  .mpvue-picker__action:first-child {
    text-align: left;
    color: #888;
  }

  .mpvue-picker__action:last-child {
    text-align: right;
  }

  .picker-item {
    text-align: center;
    line-height: 40px;
    font-size: 16px;
  }

  .mpvue-picker-view {
    position: relative;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 238px;
    background-color: rgba(255, 255, 255, 1);
  }
</style>
